Leica Rückdeckel für M-Mount-Objektive

Fits perfectly onto my M-mount lenses, and the recessed center gives enough clearance for the rear element. Solid plastic construction that doesn't feel flimsy like some others I've used.

Took a few lenses out yesterday and this cap stayed put in my bag all day, which is exactly what you want from a rear protector. The plastic feels sturdy enough that I don't worry about it cracking under normal use, and it fits the M-mount threads without any wobble.

Fits my M-mount lenses with that reassuring click and it's a genuine plastic cap, not some flimsy knockoff. The rear element stays completely dust-free even after tossing lenses loose in my bag. Exactly what you need to protect glass you care about.